Search found 1729 matches

by fredrosse
Mon Jan 11, 2021 6:54 am
Forum: Sales and Trade
Topic: Dynamo/Gen Set
Replies: 10
Views: 610

Re: Dynamo/Gen Set

From Lopez Mike: "I'd like to know more about that feed water heater. " This is a brazed plate type heat exchanger, somewhat "overkill" to heat the feedwater for our typical steamboat feedwater flow. My tube-in-tube heater is only about 0.4 square feet heat transfer surface area, and brings the feed...
by fredrosse
Mon Jan 11, 2021 6:21 am
Forum: Members' Websites and Boats
Topic: Margaret S. Sidewheeler Recent Modifications
Replies: 5
Views: 1186

Re: Margaret S. Sidewheeler Recent Modifications

The feedwater heater is simply a 1 inch diameter copper steam exhaust pipe, with a 1-1/4 inch diameter copper outer casing telescoped around the exhaust pipe, silver soldered, about 15 inches long. Feedwater is 1/2 inch copper tube, with compression fittings on each end of the 1-1/4 tube. A copper w...
by fredrosse
Sat Jan 09, 2021 2:41 pm
Forum: Sales and Trade
Topic: Dynamo/Gen Set
Replies: 10
Views: 610

Re: Dynamo/Gen Set

There are numerous PMDC (Permanent Magnet Direct Current) motors on ebay, they will function as motors or generators equally well. I prefer to get Pacific Scientific motors, they are high quality, come 12, 24, 36, 90 VDC, with RPM ranges far lower than automotive alternators. My electric boat uses a...
by fredrosse
Mon Jan 04, 2021 4:10 pm
Forum: Technical - Engines and Boilers
Topic: Stress in a Boiler Shell
Replies: 4
Views: 413

Stress in a Boiler Shell

From Mike: "Fred? Ron? Anyone with some advice on this subject?" Hoop Stress in a pressurized cylinder, as illustrated in the attached picture. Pressure Force tends to force the cylinder apart, and is equal to: Pressure x Area of pressure action = Pressure x Diameter x Length This Pressure Force is ...
by fredrosse
Tue Dec 22, 2020 11:11 am
Forum: Technical - Engines and Boilers
Topic: Building a Big Engine
Replies: 10
Views: 508

Re: Building a Big Engine

The original engines used poppet valves, and the owner of this engine wants the Marshall-Bremme valve gear that is used on my sidewheeler, with piston valves that are more appropriate for his size engine. Everything on this engine is for real functioning, so I guess he will get to buying (or buildin...
by fredrosse
Mon Dec 21, 2020 9:34 am
Forum: Technical - Engines and Boilers
Topic: Building a Big Engine
Replies: 10
Views: 508

Re: Building a Big Engine

Thanks Wesley for your suggestion, but at 74 years of age, with 4 smaller lathes in my workshop, buying another large machine is not an option for me. I'm a bit too old to be moving such machines, let alone the steel stock to make the tube is too heavy for me to lift! These parts need to be made by ...
by fredrosse
Mon Dec 21, 2020 3:09 am
Forum: Technical - Engines and Boilers
Topic: Building a Big Engine
Replies: 10
Views: 508

Re: Building a Big Engine

Detail drawing for the steam chest tubes,two are required, made from ordinary steel pipe or mechanical tubing. These drawings are made in CorelDraw, and are also available as PDF files.
by fredrosse
Mon Dec 21, 2020 3:05 am
Forum: Technical - Engines and Boilers
Topic: Building a Big Engine
Replies: 10
Views: 508

Building a Big Engine

I am participating in the building of a rather large new steamboat engine, possibly the largest reciprocating steam engine being built in this century, at about 12 feet overall height. This is a slow speed American Walking Beam Engine for a sidewheeler. The steam chest tubes (for piston valves) are ...
by fredrosse
Thu Dec 10, 2020 6:34 am
Forum: Technical - Engines and Boilers
Topic: Vacuum gauge location
Replies: 5
Views: 650

Re: Vacuum gauge location

Gauge snubbers are somewhat expensive. To dampen pulsations on a condenser line, use a long piece of silicone tubing, the elastic nature of the tubing will act like a damper (snubber) to decrease the magnitude of pulsations. Silicone is good for condenser temperatures. Small tubing, about 3mm inside...
by fredrosse
Wed Dec 09, 2020 4:36 am
Forum: Members' Websites and Boats
Topic: DetroiTug's Tug is going together
Replies: 384
Views: 200145

Re: DetroiTug's Tug is going together

Steam driven absorption heating systems were well evolved and perfected throughout the 20th century. On a steamboat, with relatively high pressure steam available, as well as hot exhaust steam, fairly good refrigeration efficiency could be available. Commercial Absorption chillers used in larger ins...